NA11

Feeder protection

The relay type NA11 can be used in radial networks as feeder or power transformer protection. In solidly grounded systems the residual overcurrent protection can be used on feeders of any lenght, while in ungrounded or Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on feeders of small lenght in order to avoid unwanted trippings due to the capacitive current contribution of the feeder on external ground fault.

Beside to the phase and residual overcurrent protections, the automatic reclosing function is provided. The NA11 device may be shipped with traditional CTs or with low power (LPCT) current inputs.

FUNCTIONS

STANDARD PROTECTIVE & CONTROL ELEMENTS

Phase overcurrent side H and side L - 50/51
Maximum Residual Overcurrent - 50N/51N(1)
Automatic Recloser - 79
Breaker Failure - BF
CT Supervision - 74CT
Trip Circuit Supervision - 74TCS
Sequence of event Recorder (SER)
Sequence of Fault Recorder (SFR)

SW PACK OPTIONAL CONFIGURATION

Digital Fault Recorder (DFR)

HW PACK OPTIONAL CONFIGURATION

Thermal with Pt100 Probes - 26

COMMUNICATION FUNCTIONS

Modbus TCP-IP
One USB Type B local port for communication with ThyVisor setup software
Modbus protocol RTU RS485 / IEC 870-5-103 / DNP3

DOWNLOADS

Flyer NA11

NA11 Coding

Manual NA11

RELATED PRODUCTS

NA10

The relay type NA10 is typically used in radial HV, MV and LV networks as feeder or power transformer protection.

In solidly grounded systems the residual overcurrent protection can be used on feeders of any lenght, while in ungrounded or Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on feeders of small lenght in order to avoid unwanted trippings due to the capacitive current contribution of the feeder on external ground fault.

The relay complies with CEI 0-16 requirements.

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XMR-A

XMR-A is a part of XMORE platform, the complete range of IEDs for Medium Voltage application including feeder, motor, generator, transformer and capacitor bank.

Thanks to Hardware and Software modularity XMR-A is flexible and scalable in term of application and performance as:

Overcurrent and Earth fault protection (StandardSW configuration)
Additional double Earth Fault input for two-side Transformer protection (SW PAC Xtra Current)
Additional Earth Fault Directional Overcurrent(SW PAC Xtra Voltage)
Small sized Motor Protection (SW PAC Motor)

The relay is compliant with CEI-016 requirements

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